To address issues such as equipment scaling, filter cloth hardening, Iow-quality gold mud, and poor gold recovery due to high hardness in gold smelting wastewater during recycling, this study optimized processes and modified systems to establish an annual treatment capacity of 792 000 m of gold smelting wastewater softening and circular utilization. The system has been successfully industrialized. Compared to direct recycling of untreated wastewater, the softened and purified water reduced the average gold grade in cyanidation tailings by 0.15 g/t, decreased sodium carbonate consumption by 3.50 kg/t, and Iowered sodium cyanide usage by 1.50 kg/t. The upgraded advanced softening process demonstrated significant effectiveness, achieving softened water hardness below 300 mg/L., fully meeting recycling requirements. Annual cost savings and revenue increased by over 13 million yuan, realizing high-value and resource-based utilization of wastewater in gold smelting enterprises.